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Selenium dioxide is the actinic admixture with the blueprint SeO2. This achromatic solid is one of the a lot of frequently encountered compounds of selenium.Solid SeO2 is a apparent polymer, the alternation consisting of alternating selenium and oxygen atoms. Each Se atom is cone-shaped and bears a terminal oxide group. The bridging Se-O band lengths are 179 message and the terminal Se-O ambit is 162 pm.

The about stereochemistry at Se alternates forth the polymer alternation (syndiotactic). In the gas appearance selenium dioxide is present as dimers and added oligomeric species, at college temperatures it is monomeric.

The monomeric anatomy adopts a angled anatomy actual agnate to that of sulfur dioxide with a band breadth of 161 pm.The dimeric anatomy has been abandoned in a low temperature argon cast and vibrational spectra announce that it has a centrosymmetric armchair form.

Dissolution of SeO2 in selenium oxydichloride accord the trimer [Se(O)O]3.Monomeric SeO2 is a arctic molecule, with the dipole moment of 2.62 D acicular from the mean of the two oxygen atoms to the selenium atom.